drvav.exe eating my memory

I have a process running that no matter what I try to do to kill it, has a rerun command that I can't find. The only folder that a file search will find this process is the Windows/Prefetch. If you delete this file, it reappears. Run adware, same 8 entries appear. Terminate the running process drvav.exe(using 50-70% of the memory), it restarts automatically. Attached a Hijackthis log file. Please help me get rid of this guy!